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External kink (peeling) modes in x-point geometry

机译:X点几何中的外部扭结(剥离)模式

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The influence of the separatrix on the stability of edge current driven external kink (peeling) modes has been studied. Two approaches have been compared: taking the limit towards the separatrix using linear ideal and resistive MHD stability codes and including the complete x-point geometry using a new resistive MHD code. A strong stabilizing effect has been observed for the ideal and the resistive peeling mode for instabilities driven by the edge current gradient. Both approaches are in good agreement. A new resistive instability remains unstable and is not significantly affected by the separatrix. This mode is a combination of a kink and a tearing type mode and could be called a peeling-tearing mode.
机译:研究了分离对边缘电流驱动的外部扭结(剥离)模式稳定性的影响。比较了两种方法:使用线性理想和电阻性MHD稳定性代码限制分离,并使用新的电阻性MHD代码包括完整的x点几何形状。对于由边缘电流梯度驱动的不稳定性,理想的电阻剥离模式具有很强的稳定作用。两种方法都非常吻合。新的电阻不稳定性仍然不稳定,并且不受分离线的明显影响。该模式是扭结和撕裂型模式的组合,可以称为剥离撕裂模式。

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